// Copyright 2013 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef V8_ALLOCATION_SITE_SCOPES_H_
#define V8_ALLOCATION_SITE_SCOPES_H_

#include "src/handles.h"
#include "src/objects.h"
#include "src/objects/allocation-site.h"
#include "src/objects/map.h"

namespace v8 {
namespace internal {

    // AllocationSiteContext is the base class for walking and copying a nested
    // boilerplate with AllocationSite and AllocationMemento support.
    class AllocationSiteContext {
    public:
        explicit AllocationSiteContext(Isolate* isolate)
        {
            isolate_ = isolate;
        }

        Handle<AllocationSite> top() { return top_; }
        Handle<AllocationSite> current() { return current_; }

        bool ShouldCreateMemento(Handle<JSObject> object) { return false; }

        Isolate* isolate() { return isolate_; }

    protected:
        void update_current_site(AllocationSite site)
        {
            *(current_.location()) = site->ptr();
        }

        inline void InitializeTraversal(Handle<AllocationSite> site);

    private:
        Isolate* isolate_;
        Handle<AllocationSite> top_;
        Handle<AllocationSite> current_;
    };

    // AllocationSiteUsageContext aids in the creation of AllocationMementos placed
    // behind some/all components of a copied object literal.
    class AllocationSiteUsageContext : public AllocationSiteContext {
    public:
        AllocationSiteUsageContext(Isolate* isolate, Handle<AllocationSite> site,
            bool activated)
            : AllocationSiteContext(isolate)
            , top_site_(site)
            , activated_(activated)
        {
        }

        inline Handle<AllocationSite> EnterNewScope();

        inline void ExitScope(Handle<AllocationSite> scope_site,
            Handle<JSObject> object);

        inline bool ShouldCreateMemento(Handle<JSObject> object);

        static const bool kCopying = true;

    private:
        Handle<AllocationSite> top_site_;
        bool activated_;
    };

} // namespace internal
} // namespace v8

#endif // V8_ALLOCATION_SITE_SCOPES_H_
